#include <stdio.h>
int g_aaaa;

// int fun();

int fun()
{

    return g_aaaa + 1;
}

int fun2()
{
    return fun();
}

int fun3()
{
    return fun();
}

typedef int (*callback_func)();

int start_task(callback_func f, int a) {}

int main()
{
    start_task(fun2, 0);
    start_task(fun3, 2);
}